饱和砂土液化特性的振动台试验研究
Shaking Table Test Study on Liquefaction Characteristics of Saturated Sandy

饱和砂土液化是地震循环动荷载作用下常见的工程地质灾害，往往会对工程结构造成重大破坏。为深入探究不同密实度下饱和砂土的液化特性，利用振动台设备对相对密度为66%、78%、90%的饱和砂土依次输入6种工况的震动加载试验。通过计算分析超静孔隙水压力、超静孔压比、加速度响应和土体沉降等的发展演化规律，从而研究地震作用下不同密实度饱和砂土的液化规律。结果表明：随地震波加载峰值增大，饱和砂土液化程度增大，抗液化强度逐渐减小；密实度与抗液化能力呈正比。
Liquefaction of saturated sand is a common engineering geological disaster under cyclic dynamic seismic loads, which often causes great damage to engineering structures. In order to further explore the liquefaction characteristics of saturated sand under different density, a vibration loading test of the saturated sand with relative density of 66%, 78% and 90% was carried out under six conditions. The liquefaction laws of saturated sand with different densities under earthquake conditions are studied by calculating and analysing the development and evolution laws of excess pore water pressure, excess pore pressure ratio, acceleration response and soil settlement. The findings indicate that the degree of liquefaction in saturated sand increases with the peak value of seismic wave loading, while the liquefaction resistance decreases gradually. The compactness of the sand has been found to be directly proportional to its resistance to liquefaction.